Pure Resources Limited (ASX: PR1) has staked 13.5km2 of exploration claims in the Crystal Mountain Pegmatite District, Colorado, USA. The claims cover three historical, artisanal mines including the Kings Canyon, Debbie Doll, and Buckhorn mines.
The Crystal Mountain District is approximately 21km west of Fort Collins, Loveland, Colorado. The Crystal Mountain pegmatites occur within Precambrian high-grade metamorphic phyllites and schists and are the same age (1.78Ga old) and mineralogically resemble the pegmatites in the southern Black Hills of South Dakota (e.g IR1 Custer Project) (Jacobsen 1986).
The Crystal Mountain District is typical of many pegmatite districts in the United States which are rich in beryl and phosphates, with columbitetantalite and spodumene. It is interpreted that there is a district-wide pegmatite zonation with distance from the Longs Peak – St Vrain and Mount Olympus Granites (source granites) with barren quartz-plagioclase-muscovite-kspar, followed by beryl-bearing pegmatites with the spodumene-bearing pegmatites the most distal (Cerny 1982).
Although the Crystal Mountain District is mostly known for its beryl occurrences lithium minerals are present in many of the pegmatites. In particular, the Big Boulder-Kings Canyon lineament is a known lithium-bearing pegmatite area (Jacobsen 1986).
The complete absence of modern exploration represents a genuine greenfield opportunity for the company to discover a spodumene rich lithium deposit. Additionally, reconnaissance mapping and sampling is underway and will target historically documented spodumene bearing pegmatites.
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